#ifndef __M_CONNECTION_H__
#define __M_CONNECTION_H__

#include "muduo/proto/dispatcher.h"
#include "muduo/proto/codec.h"
#include "muduo/base/Logging.h"
#include "muduo/base/Mutex.h"
#include "muduo/net/EventLoop.h"
#include "muduo/net/TcpClient.h"
#include "muduo/net/EventLoopThread.h"
#include "muduo/base/CountDownLatch.h"

#include "mq_channel.hpp"
#include "mq_worker.hpp"

namespace lywmq
{

class Connection
{
public:
    using ptr = std::shared_ptr<Connection>;
    Connection(const std::string& sip, int sport, const AsyncWorker::ptr& worker)
    :_latch(1)
    ,_client(worker->loopthread.startLoop(), muduo::net::InetAddress(sip, sport), "Client")
    ,_dispatcher(std::bind(&Connection::onUnknownMessage, this, std::placeholders::_1, 
        std::placeholders::_2, std::placeholders::_3))
    ,_codec(std::make_shared<ProtobufCodec>(std::bind(&ProtobufDispatcher::onProtobufMessage, &_dispatcher, std::placeholders::_1, 
        std::placeholders::_2, std::placeholders::_3)))
    ,_worker(worker)
    ,_channel_manager(std::make_shared<ChannelManager>())
    {
        // 注册业务请求处理函数
        _dispatcher.registerMessageCallback<basicCommonResponse>(std::bind(&Connection::basicResponse, this, 
            std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

        _dispatcher.registerMessageCallback<basicConsumeResponse>(std::bind(&Connection::consumeResponse, this, 
            std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
        
        _client.setMessageCallback(std::bind(&ProtobufCodec::onMessage, _codec, 
            std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));

        _client.setConnectionCallback(std::bind(&Connection::onConnection, this, std::placeholders::_1));

        _client.connect();
        _latch.wait(); // 阻塞等待，直到连接建立成功
    }
    Channel::ptr openChannel()
    {
        Channel::ptr channel = _channel_manager->create(_conn, _codec);
        bool ret = channel->openChannel();
        if (ret == false) {
            DLOG("打开信道失败！");
            return Channel::ptr();
        }
        return channel;
    }
    void closeChannel(const Channel::ptr& channel)
    {
        channel->closeChannel();
        _channel_manager->remove(channel->cid());
    }
private:
    void basicResponse(const muduo::net::TcpConnectionPtr& conn, const basicCommonResponsePtr& message, muduo::Timestamp)
    {
        // 找到信道
        Channel::ptr channel = _channel_manager->get(message->cid());
        if (channel.get() == nullptr) 
        {
            DLOG("未找到信道信息！");
            return;
        }
        // 将得到的响应对象，添加到信道的基础响应hash_map中
        channel->putBasicResponse(message);
    }
    void consumeResponse(const muduo::net::TcpConnectionPtr& conn, const basicConsumeResponsePtr& message, muduo::Timestamp)
    {
        // 找到信道
        Channel::ptr channel = _channel_manager->get(message->cid());
        if (channel.get() == nullptr) 
        {
            DLOG("未找到信道信息！");
            return;
        }
        // 封装异步任务（消息处理任务），抛入线程池
        _worker->pool.push([channel, message](){
            channel->consume(message);
        });
    } 
    void onConnection(const muduo::net::TcpConnectionPtr& conn)
    {
        if (conn->connected())
        {
            _latch.countDown();
            _conn = conn;
        }
        else
        {
            _conn.reset();
        }
    }
    void onUnknownMessage(const muduo::net::TcpConnectionPtr& conn, const MessagePtr& message, muduo::Timestamp)
    {
        LOG_INFO << "onUnknownMessage: " << message->GetTypeName();
        conn->shutdown();
    }
private:
    muduo::CountDownLatch _latch; // 实现同步
    muduo::net::TcpConnectionPtr _conn; // 客户端对应的连接
    muduo::net::TcpClient _client; // 客户端
    ProtobufDispatcher _dispatcher; // 请求分发器
    ProtobufCodecPtr _codec; // 协议处理器
    AsyncWorker::ptr _worker;
    ChannelManager::ptr _channel_manager;
};

}

#endif